Mesa police have arrested a 17-year-old boy who they believe helped his 16-year-old friend kill his mother, officials said.

The two teens, both of whom were booked into juvenile detention, could be charged as adults in the death of 36-year-old Tina Helms Spencer, who was found dead about 4 a.m. Saturday at a home near Gilbert Road and U.S. 60, Mesa Police Department spokesman Sgt. Tony Landato said. Officers had responded to the home for reports of an altercation.

Police arrested Spencer’s 16-year-old son later that day, and arrested the friend some time overnight, he said.

The son was booked on one count of first-degree murder of his mother, attempted first-degree murder of his stepfather, three counts of aggravated assault of his stepfather, concealment of a dead body and tampering with evidence, Landato said.

His friend was booked on one count each of accomplice to first-degree murder, concealment of a dead body and tampering with evidence, he said.

“We anticipate a transfer hearing in the near future where a court will decide if both will be charged as adults,” Landato said.

Details on how Spencer was killed and surrounding the attempted murder, assault, concealment and evidence tampering charges were not immediately available.

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